Answers
A)h=30, solve for t
30=-5t^2+25t
5(t^2-5t+6)=0
5(t-3)(t-2)=0
t=2 (ball going up) or
t=3 (ball going down)
b) h=0, solve for t
0=-5t^2+25t
5t(5-t)=0
t=0 or t=5
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